Article Photos: Mexico swears in president amid violent protests 51/54

A demonstrator lights up a spray next to riot police in Mexico City, Saturday Dec. 1, 2012.  Protesters opposed to  newly sworn-in Mexican President Enrique Pena Nieto  clashed with tear gas-wielding police early Saturday near the National Congress, where Pena Nieto took the oath of office. (AP Photo/Eduardo Verdugo)